DCA
C1A05 BRAKE SW/STOP LAMP SW
Description
- ICC brake switch is turned OFF and stop lamp switch is turned ON, when depressing the brake pedal.
- ICC brake switch signal and stop lamp switch signal are input to ECM. These signals are transmitted from
ECM to ICC sensor integrated unit via CAN communication.
DTC Logic
DTC DETECTION LOGIC
DTC Detection Logic:
NOTE:
If DTC "C1A05" is detected along with DTC "U1000", first diagnose the DTC "U1000". Refer to DCA DCA DCA DCA
Diagnosis Procedure
1.CHECK SELF-DIAGNOSIS RESULTS
1. Perform "All DTC Reading" with CONSULT-III.
2. Check if the "U1000" is detected other than "C1A05" in "Self Diagnostic Result" of "ICC".
Is "U1000" detected?
YES - Perform the CAN communication system inspection. Repair or replace the malfunctioning parts. Refer to DCA.
NO - GO TO 2.
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
Check that "STOP LAMP SW" and "BRAKE SW" operate normally in "DATA MONITOR" of "ICC".
Is the inspection result normal?
YES - GO TO 12.
NO-1 - When "BRAKE SW" operation is malfunctioning: GO TO 3.
NO-2 - When "STOP LAMP SW" operation is malfunctioning: GO TO 8.
3.CHECK ICC BRAKE SWITCH INSTALLATION
1. Turn ignition switch OFF.
2. Check ICC brake switch for correct installation. Refer to Procedures.
Is the inspection result normal?
YES - GO TO 4.
NO - Adjust ICC brake switch installation. Refer to Procedures.
4.ICC BRAKE SWITCH INSPECTION
1. Disconnect ICC brake switch connector.
2. Check ICC brake switch. Refer to DCA.
Is the inspection result normal?
YES - GO TO 5.
NO - Replace ICC brake switch.
5.CHECK ICC BRAKE HOLD RELAY
1. Remove ICC brake hold relay.
2. Check for continuity between ICC brake hold relay terminals.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace ICC brake hold relay.
6.CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC BRAKE SWITCH
1. Check for continuity between ICC brake hold relay harness connector and ICC brake switch harness connector.
2. Check for continuity between ICC brake hold relay harness connector and ground.
Is the inspection result normal?
YES - GO TO 7.
NO - Repair the harnesses or connectors.
7.CHECK HARNESS BETWEEN ECM AND ICC BRAKE SWITCH
1. Disconnect ECM connector.
2. Check for continuity between the ECM harness connector and ICC brake switch harness connector.
3. Check for continuity between ECM harness connector and ground.
Is the inspection result normal?
YES - GO TO 12.
NO - Repair the harnesses or connectors.
8.CHECK STOP LAMP FOR ILLUMINATION
Check the stop lamp for illumination.
Is the inspection result normal?
YES - GO TO 9.
NO - Repair the stop lamp circuit.
9.CHECK ICC BRAKE HOLD RELAY
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check for continuity between ICC brake hold relay terminals.
Is the inspection result normal?
YES - GO TO 10.
NO - Replace ICC brake hold relay.
10.CHECK HARNESS BETWEEN ECM AND ICC BRAKE HOLD RELAY
1. Disconnect ECM, rear combination lamp, and high-mounted stop lamp connectors.
2. Check for continuity between the ECM harness connector and ICC brake hold relay harness connector.
3. Check for continuity between ECM harness connector and ground.
Is the inspection result normal?
YES - GO TO 11.
NO - Repair the harnesses or connectors.
11.CHECK HARNESS BETWEEN BRAKE BOOSTER CONTROL UNIT AND ICC BRAKE HOLD RELAY
1. Disconnect brake booster control unit connector.
2. Check for continuity between the brake booster control unit harness connector and brake hold relay harness connector.
3. Check for continuity between brake booster control unit harness connector and ground.
Is the inspection result normal?
YES - GO TO 12.
NO - Repair the harnesses or connectors.
12.PERFORM SELF-DIAGNOSIS OF ECM
1. Connect all connectors again if the connectors are disconnected.
2. Turn ignition switch ON.
3. Perform "All DTC Reading".
4. Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE". Refer to Testing and Inspection(VQ35HR) or Testing and Inspection (VK50VE).
Is any DTC detected?
YES - Repair or replace the malfunctioning parts identified by the self-diagnosis result.
NO - GO TO 13.
13.CHECK ICC BRAKE HOLD RELAY DRIVE SIGNAL OUTPUT
1. Select the active test item "STOP LAMP" of "ICC".
2. Check if "STP LMP DRIVE" is turned ON when operating the test item.
Is the inspection result normal?
YES - Replace brake booster control unit.
NO - Replace ICC sensor integrated unit. Refer to Exploded View.
Component Inspection (ICC Brake Switch)
1.CHECK ICC BRAKE SWITCH
Check for continuity between ICC brake switch terminals.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace ICC brake switch.
Component Inspection (Stop Lamp Switch)
1.CHECK STOP LAMP SWITCH
Check for continuity between stop lamp switch terminals.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace stop lamp switch.
Special Repair Requirement
DESCRIPTION
Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following operation is performed.
- Removal and installation of ICC sensor integrated unit
- Replacement of ICC sensor integrated unit
SPECIAL REPAIR REQUIREMENT
1.LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT
Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to ICC (Full Speed Range) ICC (Full Speed Range) Description
- GO TO 2.
2.CHECK DCA SYSTEM
1. Erase the "self-diagnosis results", and then perform "All DTC Reading" again after performing the action test. (Refer to DCA for action test.)
2. Check that the DCA system is normal.
- WORK END